National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

61°F

16°C

Humidity 60%
Wind Speed NW 3 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 19 Oct 10:10 AM PDT
Extended Forecast for

Portola Valley CA

  • Today

    Today: Increasing clouds, with a high near 67. West wind 6 to 9 mph.

    High: 67 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 47. West wind 5 to 7 mph becoming calm in the evening.

    Low: 47 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69. Calm wind.

    High: 69 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers, mainly after 11pm. Mostly cloudy, with a low around 49. Calm wind. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers. Patchy fog before 10am. High near 69. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 69 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers, mainly before 11pm. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: A 20 percent chance of showers. Patchy fog before 11am. Otherwise, partly sunny, with a high near 68.

    High: 68 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 67. West wind 6 to 9 mph.
Tonight
Mostly cloudy, with a low around 47. West wind 5 to 7 mph becoming calm in the evening.
Tuesday
Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69. Calm wind.
Tuesday Night
A 50 percent chance of showers, mainly after 11pm. Mostly cloudy, with a low around 49. Calm wind. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Showers. Patchy fog before 10am. High near 69. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 40 percent chance of showers, mainly before 11pm. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 49.
Thursday
A 20 percent chance of showers. Patchy fog before 11am. Otherwise, partly sunny, with a high near 68.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Sunny, with a high near 71.
Friday Night
Clear, with a low around 46.
Saturday
Sunny, with a high near 73.
Saturday Night
A slight chance of rain. Partly cloudy, with a low around 48.
Sunday
A slight chance of rain. Mostly sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.39°N 122.23°W (Elev. 397 ft)
Last Update:
2:37 am PDT Oct 19, 2026
Forecast Valid:
10am PDT Oct 19, 2026-6pm PDT Oct 25, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation